third_party/WebKit/Source/core/paint/ScrollRecorder.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef ScrollRecorder_h
   6 #define ScrollRecorder_h
   7
   8 #include "core/CoreExport.h"
   9 #include "core/paint/PaintPhase.h"
  10 #include "platform/geometry/IntSize.h"
  11 #include "platform/graphics/paint/DisplayItem.h"
  12 #include "wtf/FastAllocBase.h"
  13
  14 namespace blink {
  15
  16 class GraphicsContext;
  17
  18 // Emits display items which represent a region which is scrollable, so that it
  19 // can be translated by the scroll offset.
  20 class CORE_EXPORT ScrollRecorder {
  21     WTF_MAKE_FAST_ALLOCATED(ScrollRecorder);
  22 public:
  23     ScrollRecorder(GraphicsContext&, const DisplayItemClientWrapper&, PaintPhase, const IntSize& currentOffset);
  24     ~ScrollRecorder();
  25 private:
  26     DisplayItemClientWrapper m_client;
  27     DisplayItem::Type m_beginItemType;
  28     GraphicsContext& m_context;
  29 };
  30
  31 } // namespace blink
  32
  33 #endif // ScrollRecorder_h